Profiling device for grinding wheels



Dec. 18, 1951 M. JELLIS Emu. v

PROFILING DEVICE FOR GRINDING WHEELS 2 Sl-IEETS-SHEET 1 Filed Aug. 17, 1949 Inventors Morgan Jellis Thomas W. Langley pen" . aazmewm Attorneys 5 J ELLIS ETAL PROFILING DEVICE FOR GRINDING WHEELS 2 SliEETS-SHEET 2 Filed Aug. 17, 1949' Inventors:

FIG 4 I Morgan Jellis Thomas W. Langley per Attorneys Patented Dec. 18, 1951 Coventry,

-Gauge & Tool Company England England, assignors. to 'Coventry Limited, Coventry,

" Kiiplication August 17, 1949, Serial No. 110,773

Y In Great Britain August 2o, 1948 1 Claim. (01. 125-11) This. invention relates todevices for profil-v ing .the peripheries of ribbed'grinding wheels of. the typerwherein one or .more dressing tools have imparted, thereto a generated motion and has for its object to provide improved means whereby .a generated motion is imparted to the dressingtool or each dressing tool.

In the accompanying .drawings,

Figure 1 is'a plan' view of a grinding wheel dressing device according to this invention.

Figure 2 is a part sectional front view, the section being taken on the line 2-2 of Figure 1.

Figure 3 is a side view of the device partly in section at the forward end thereof, and

Figure 4 is an elevation of a gauge used with the device showing its use in relationship to the latter.

Referring to the drawings, the device consists of a carrier or body member I adapted to be mounted so as to be capable of being fed towards and away from a grinding wheel 2 preferably when the latter is mounted in a grinding machine. The said carrier may be also mounted on a slide operated by a lead screw or the like for the purposes of providing traverse across the grinding wheel when desired.

In the foregoing description the said carrier is regarded as being arranged for vertical feeding down onto a grinding wheel, but it is to be understood that a device according to the present invention could be fed to the grinding wheel along any axis radial to the wheel, for example, along a horizontal axis.

Disposed in a vertical plane in the carrier I are two slides 3, 4, one each side of the feeding axis of the carrier I and inclined thereto so as to be arranged in a complementary manner.

Each slide 3 or 4 carries at its forward end a tool holder 5, 6 for a diamond tool I, 8 so that the axis of each tool I, 8 is preferably parallel with the feeding axis of the carrier I indicated by the arrow A (Figure 2).

Associated with the upper end or head 9, I of each slide 3, 4 is a lever II, I2 which bears against each said head 9, I0, said lever being fixedly carried by the rear end of a shaft I3, I4 which shafts are journalled in an upper part of the carrier I and extend to the front thereof. The forward ends of said shafts I3, I 4 each fixedly carry a further lever l5, I the end of which is adapted to abut a stationary member I1 (Figure 3), for example a fixed part of a grinding machine in which the grinding wheel 2 to be dressed is mounted.

The ends of said levers II, I2, I5 and I6 are preferably provided with rollers I8 at their points of contact.

r The arrangement of the slides3, 4 and the levers II, I2 bearing against the heads 9, Illof same,; and the lengths of the shafts I3, I4 is such that the. tool holders 5, 6 are staggered with respect to one another (Figures 1 and 3).

Each slide 3, 4 is restrained from moving under the influence of gravity owing to the frictional engagement of a spring'urged plunger 23 therewith as shown in the case of the slide 4 in Figure. 2.. Y I

In operation of the device the carrier i is fed towards the grinding wheel 2 whereupon on the said forward levers I5, I6 contacting the fixed part I! of the machine the shafts I3, I4 associated therewith are rotated so that the levers II, l2 at the rear ends of said shaft impart movement to the slides 3, 4 which carry the tool holders 5, 6. Thus the motion of each tool I, 8 is the resultant of two motions viz: the feeding motion of the carrier I and the motion of the slide carrying the tool holder in said carrier I at an angle to the feeding axis of the latter. In this way the requisite motion of each tool I, 8 is generated to simultaneously dress opposite flanks of the rib form of the grinding wheel 2. Furthermore the motions of both tools I, 8 are derived from the simple feed motion of the carrier I.

The heads 9, III of the slides 3, A are preferably axially adjustable with respect thereto by screw or other suitable means I9, 20 to enable the tools I, 8 to be set.

In order to initially set the tools I, B a gauge 2! (Figure 4) is preferably provided whereby the said tools are set as for the coarsest pitch of ribbed grinding wheel within the capacity of the device.

Once initially set with the gauge 2| the device does not normally require further setting with said gauge and in order to set the tools i, 8 for ribbed grinding wheels of finer pitch it is only necessary to insert a suitable slip gauge 22 on the support or platform 23 provided on the carrier I (Figures 2 and 3) to raise the position of the member 24 against which the arms I5, I6 rest when they are clear of the stationary member I1.

The insertion of a slip gauge 22 and resultant raising of the member 24 angularly adjusts the arms I5, I6, and hence the arms Ii, I2 to move the slides 3, 4 in a downward direction to move the tools I, 8 closer to alignment with one another.

In this way the tools 1, 8 commence the profiling of a grinding wheel at a predetermined setting in accordance with the pitch of the latter.

In practice a set of slip gauges is provided corresponding to the pitches of the range of grinding wheels that can be dressed by the device.

A further application of the device in addition to trueing the rib form is that on the tools I, 8 reaching the root of the rib form (the'tools I, 8 being then in line parallelwith the feeding axis) the feed to the carrier 1 may be continued for a short distance so that the tools 1, 8 cross over to form a clearance 25 (Figure 2) at the said root which is desirable in wheels for grinding a threaded or toothed workpiece having a truncated or flattened crest to the threads or teeth thereof.

We claim:

A profiling device for grinding wheels comprising a carrier adapted to be fed towards a grindlng wheel; a pair of slides mounted for axial sliding movement in said carrier, said slides being mutually inclined and staggered with respect to one another; a pair of tool holders carried by and extending from the adjacent ends of said slides, one tool holder being carried by each slide, said tool holders being disposed parallel to one another; heads on said slides at the other ends thereof; a pair of shafts journalled on said car- 30 rier; a pair of levers fixedly mounted one on each of said shafts, each lever being disposed for contact with a corresponding head of one of said-slides; arid a pair of further levers fixedly mounted one on each of said shafts, the free ends of said levers protruding from the carrier for contact with an extraneous fixed member so that on feeding movement of said carrier contact of the free ends of said further levcrswith the extraneous fixed member eflects actuation of the said levers and shafts to in turn operate said slides to automatically impart a pre-determined generated motion to the tool holders, which motion is the resultant of the feeding movement of the carrier and the slides therein.

MORGAN JELLIS.

THOMAS WINSMORE LANGLEY.

REFERENCES crrEo The following references are of record in the 'file of this patent:

UNITED STATES PATENTS 

